Everything, as simple as that.
Funny moments:
-When chopper blew the whistle on skypia while he was on the ship alone.
-Cindy-chan and her ominious predictions.
-Brook's jokes.
-Luffy's chopper imitation.
-Sanji in kammabakka
-the list goes on...
Epic moments:
-Luffy's phrases (say you want to live!; If you're gonna risk your life you may as well risk our lives as well! We're all Nakama!, more and more)
-Almost all fights, epic in their own way.